When shooting with TTL vs manual exposure, what is the difference and when should you prefer manual for commercial shoots?

• A. TTL uses camera metering to set exposure automatically; manual sets a fixed exposure.
• B. TTL requires the photographer to guess exposure; manual is automatic.
• C. TTL uses a handheld meter, while manual uses the camera meter.
• D. TTL is always slower than manual.

Answer: (A)

The main idea here is how exposure is determined when you’re using flash. TTL, or through-the-lens metering, lets the camera gauge the scene and automatically adjust the flash output to hit the target exposure. Manual exposure, on the other hand, has you lock in a fixed exposure by choosing your shutter speed, aperture, ISO, and flash power, and the exposure stays the same regardless of changes in the scene.

For commercial shoots, manual is the better choice when you need consistency and repeatability across many shots. With controlled studio lighting, you want the lighting setup to behave exactly the same from frame to frame, so you set your exposure once and keep it fixed. This avoids any fluctuations that can come from automated TTL adjustments, variations in modifiers, or subtle changes in subject reflectivity. TTL can be handy for fast work or when lighting conditions are changing, but for catalog, product, or fashion shots where every image must match, manual exposure provides the most reliable results.